At present, the gap between static French-made and imported instruments is mainly at the pressure of 0.00000001-0.0001. The pore diameter corresponding to this pressure is 0.4-0.61nm. The pore size distribution above 0.61nm and the pore volume are very small. The customer found that the reason why the specific surface test value of imported and domestic static method instruments is very close (BET method specific surface test requires a partial pressure of 0.05-0.30); so the main gap between imported instruments and domestic instruments is in the micropore section, the exact Said in the 0.35-0.61nm segment; the test results for 0.61-2nm micropores, 2-50nm mesopores, and 50-400nm macropores are very close; (Additionally, foreign manufacturers do in micropores It is indeed very good, but for the lower limit of 0.35nm, we communicated with their technicians. They objectively said that the lower limit of 0.35nm requires special methods, such as changing to other adsorbed gases, and it is very laborious. Reaching that is bragging). To measure the micropore section below 0.61nm, it is necessary to match the molecular pump. This will inevitably increase the price of the instrument. This point needs to be considered by the model selector.
In addition, for the high partial pressure section, the requirements for the instrument are also very high, mainly for the P0 test. The accuracy of P0 directly affects the value of the partial pressure P / P0. For example, the pore diameter corresponding to the partial pressure of 0.99 is 197.7nm. The diameter of the hole corresponding to 0.996 has reached 487nm, so this hole diameter is very sensitive to partial pressure, the instrument should have an independent P0 test pipeline and process; In addition, with regard to imported and domestic vacuum pumps, Best Side uses its custom-made bipolar direct-connected vacuum pumps with a limit vacuum of 10-2Pa, and there are also imported pumps for customers to choose from; vacuum pumps are very mature equipment, almost The technical threshold that is difficult to achieve, whether to choose domestic or imported, is completely based on the budget, and the performance does not cause a noticeable impact on the use;
The partial data of nitrogen partial pressure and hole diameter are attached for netizens' reference:
Disinfectant Tissue,Disinfecting Dry Tissue,Nano Disinfecting Tissue,Disposable Disinfectant Tissue
Yafeng Paper Industry Co., Ltd , https://www.tenoutissue.com